Have you tested or replaced the throttle position module? Your 96 model is in the years of bad ignition switches, which can cause various problems when it becomes faulty. My 95 had SES and throttle light for some time then 1st gear only, some days. A new ignition switch fixed it, it was a pain to fit, and was more than $100.
Grant H.
1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, new engine, 0 miles. 3.73 diff, 16 mpg
1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.
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